How Often Should You Clean a Driveway?

The Quick Answer

As a general rule of thumb, you should pressure wash your concrete driveway once every 12 months. In high-shade areas or very wet climates, you may need to increase this to once every 6-8 months.

Factors That Increase Cleaning Frequency

• Tree Canopy: Heavy oak or pine canopies drop sap, leaves, and tannin-rich acorns that stain concrete incredibly fast.
• Poor Drainage: If your driveway has 'bird baths' (low spots where puddles form after rain), those areas will cultivate dark green and black algae blooms constantly.
• Automotive Use: If you work on cars or own older vehicles that drip oil and power steering fluid, more frequent spot-cleaning is required to prevent permanent deep-staining.

The Hidden Dangers of Algae Buildup

When a driveway turns black, it isn't just dirt. The black coating is a rapidly reproducing colony of cyanobacteria (Gloeocapsa Magma) and algae. When this biological mat gets wet from morning dew or light rain, it becomes as slippery as black ice, acting as a massive slip-and-fall hazard for your family or delivery drivers.